The chanting of a pure devotee is especially effective

HARE KRISHNA
The chanting of the Hare Krsna mantra should be heard from the lips of a pure devotee of the Lord: When the mantra is chanted by a pure devotee of the Lord in love, it has the greatest efficacy on hearers, and as such this chanting should be heard from the lips of a pure devotee of the Lord, so that immediate effects can be achieved

effective